must ossify
Regular verb: ossify - ossified- ossified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must ossify
you must ossify
he must ossify
we must ossify
you must ossify
they must ossify 	I must be ossifying
you must be ossifying
he must be ossifying
we must be ossifying
you must be ossifying
they must be ossifying	I must have ossified
you must have ossified
he must have ossified
we must have ossified
you must have ossified
they must have ossified	I must have been ossifying
you must have been ossifying
he must have been ossifying
we must have been ossifying
you must have been ossifying
they must have been ossifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not ossify
you must not ossify
he must not ossify
we must not ossify
you must not ossify
they must not ossify 	I must not be ossifying
you must not be ossifying
he must not be ossifying
we must not be ossifying
you must not be ossifying
they must not be ossifying	I must not have ossified
you must not have ossified
he must not have ossified
we must not have ossified
you must not have ossified
they must not have ossified	I must not have been ossifying
you must not have been ossifying
he must not have been ossifying
we must not have been ossifying
you must not have been ossifying
they must not have been ossifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I ossify?
must you ossify?
must he ossify?
must we ossify?
must you ossify?
must they ossify? 	must I be ossifying?
must you be ossifying?
must he be ossifying?
must we be ossifying?
must you be ossifying?
must they be ossifying? 	must I have ossified?
must you have ossified?
must he have ossified?
must we have ossified?
must you have ossified?
must they have ossified? 	must I have been ossifying?
must you have been ossifying?
must he have been ossifying?
must we have been ossifying?
must you have been ossifying?
must they have been ossifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not ossify?
must you not ossify?
must he not ossify?
must we not ossify?
must you not ossify?
must they not ossify? 	must I not be ossifying?
must you not be ossifying?
must he not be ossifying?
must we not be ossifying?
must you not be ossifying?
must they not be ossifying? 	must I not have ossified?
must you not have ossified?
must he not have ossified?
must we not have ossified?
must you not have ossified?
must they not have ossified? 	must I not have been ossifying?
must you not have been ossifying?
must he not have been ossifying?
must we not have been ossifying?
must you not have been ossifying?
must they not have been ossifying?